CN2881986Y

CN2881986Y - Combined cross coupling device

Info

Publication number: CN2881986Y
Application number: CN 200620013312
Authority: CN
Inventors: 刘宁; 黄专喜
Original assignee: Mobi Antenna Technologies Shenzhen Co Ltd
Current assignee: Mobi Antenna Technologies Shenzhen Co Ltd
Priority date: 2006-03-29
Filing date: 2006-03-29
Publication date: 2007-03-21
Anticipated expiration: 2016-03-29

Abstract

The utility model discloses a combined cross coupling device, which comprises at least two pairs of resonators located in the layout of resonator in the microwave filter. The coupling between two adjacent resonators is realized by a coupling window. The coupling between two non-adjacent resonators is realized by a cross coupling. Between two non-adjacent resonators, at least two capacitive or inductive cross coupling controlling elements are provided, so as to add transmission zero in the transmission feature of the filter, hence improve out-of-band suppression. The filter, duplexer and combiner using the utility model can use 4 resonating cavities to generate two transmission zeros at the high end or low end of the transmission band, but until recently 5 resonating cavities are required to generate two transmission zeros at the high end or low end of the transmission band. Comparing with prior technology, the utility model greatly reduces the volume of filter, duplexer and combiner, greatly improves out-of-band suppression, and provides controlling elements with increased or reduced cross coupling, so that the control of transmission zero becomes easier.

Description

A kind of combination cross-couplings device

Technical field

The utility model relates in the filter that is used for communication equipment, duplexer, the mixer the especially combination cross-couplings device in narrow band filter.

Background technology

Along with development of wireless communication devices, overall dimensions becomes a significant consideration of microwave filter.Now in some communication equipment, often the filter that need use is a degree of inhibition outside there is very high band on one side of passband, and require also very high to the Insertion Loss of passband, want to realize high band degree of inhibition and little passband Insertion Loss outward like this, two kinds of methods are generally arranged: one, realize with coaxial cavity filter, like this volume can be very big, realizes than being easier to.Realize with the dielectric cavity fluid filter that two, cost can be very high like this, also bad realization.Therefore, need introducing a kind of suitable device is implemented in and has under the situation with volume that high band is outer to be suppressed and passband Insertion Loss preferably.

The utility model content

Technical problem to be solved in the utility model is to be provided at a kind of novel combination cross-couplings device in the microwave transmission filter.

For achieving the above object, the technical solution adopted in the utility model is: combination cross-couplings device is included at least two pairs of resonators in the resonator layout of microwave filter, coupling between the adjacent resonators is realized by coupling window, adopts cross-couplings between the non-adjacent resonator.

Be provided with at least two capacitives or perceptual cross-coupling control element between the non-adjacent resonator,, improve the outer inhibition degree of band to add transmission zero in the transmission characteristic that is implemented in filter.

Capacitive described in the such scheme or perceptual cross-coupling control element are preferably coupling window, U molded lines or coupling supporter.

Described filter is a coaxial cavity filter, and described coaxial cavity filter comprises the coaxial cavity resonator more than four, and two cross-coupling control elements between non-adjacent resonator, is coupled by window between the adjacent resonators.

The beneficial effects of the utility model are: adopt filter of the present utility model, high-end or the low side that duplexer and mixer can utilize 4 resonant cavitys to be implemented in the transmission passband produces two transmission zeros, and the high-end or low side that needed 5 resonant cavitys to be implemented in the transmission passband in the past produces two transmission zeros, and will increase cavity volume and processing like this, costs such as debugging, compared with prior art reduced filter greatly, the volume of duplexer and mixer, improved the outer inhibition of band greatly, provide to increase or reduce cross-linked control element to make that the control of transmission zero is convenient.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is described in further details:

Fig. 1 is the front view of the utility model embodiment one;

Fig. 2 is the stereogram (no cover plate) of the utility model embodiment one;

Fig. 3 is the stereogram of the utility model embodiment one;

Fig. 4 is the front view of the utility model embodiment two;

Fig. 5 is the stereogram (no cover plate) of the utility model embodiment two;

Fig. 6 is the stereogram of the utility model embodiment two.

Embodiment

Shown in each figure, 1 is the radio-frequency joint of transmitting radio frequency signal, 2 for connecting the silver-colored line of radio-frequency joint and

resonant rod

3,4 for connecting the coupling window between the resonant cavity, can regulate coupling amount between the resonant rod by the size of regulating

coupling window

4,5 are U molded lines (being made by silver-colored line), can regulate coupling amount between the resonant rod 3 by regulating the degree of depth that U molded lines 5 enters cavity 9,6 is the fixed card of U molded

lines

5,8 is the fixing hole of securing cover plate 11 and cavity 9,10 is the tuning screw rod on the cover plate, by regulating tuning screw rod 10, can regulate the resonance frequency of each resonant rod 3 and the coupling amount between the resonant rod 3.11 is cover plate, and 12 are the coupling supporter.

Fig. 1, Fig. 2, Fig. 3 are the utility model embodiment one, as shown in the figure, and A, B, C, D, be respectively four resonant cavitys that are arranged in cavity 9, A-B wherein, B-C, C-D, be adjacent resonant cavity, coupling between them is realized that by coupling window 4 A-D is that the coupling between the non-adjacent resonant cavity is a cross-couplings, is realized by coupling window 4 (or U molded lines 5).B-D is non-adjacent resonant cavity, and the coupling between them is realized by coupling window 4 (or coupling supporter 12).Work as A-D, coupling between the B-D just is when being coupled (being coupling window 4 or U molded lines 5), then can be in a pair of transmission zero of high-end generation of transmission passband, the distance of transmission zero can be adjusted A-D, the window size 4 of B-D (or U molded lines 5 degree of depth that enters cavity is controlled).

Fig. 4, Fig. 5, Fig. 6 are the utility model embodiment two, the difference of it and embodiment one and the coupling between the B-D changed into negative coupling (being realized by coupling supporter 12), at this moment, then the low side at the transmission passband produces a pair of transmission pole.The distance of transmission pole can be adjusted the window size 4 of A-D and the length of the coupling supporter 12 between the adjustment B-D realizes.

In actual applications, the just coupling between them can be opened coupling window 4 or add U molded lines 5 and be produced, and negative coupling can be waited by coupling supporter 12 and realize.

To sum up, adopt method described in the utility model, compared with prior art, the volume of wave filter is reduced, effectively Reduced cost, it is passive that the utility model can be widely used in cavity body filter, duplexer, combiner in the communication equipment etc. In the product.

Claims

1, a kind of combination cross-couplings device is characterized in that: be included at least two pairs of resonators in the resonator layout of microwave filter, the coupling between the adjacent resonators is realized that by coupling window non-adjacent resonator adopts cross-couplings.

2, combination cross-couplings device as claimed in claim 1 is characterized in that: be provided with capacitive or perceptual cross-coupling control element between the described non-adjacent resonator.

3, combination cross-couplings device as claimed in claim 1 or 2 is characterized in that: described cross-coupling control element is coupling window, U molded lines or coupling supporter.

4, combination cross-couplings device as claimed in claim 3, it is characterized in that: described filter is a coaxial cavity filter, described coaxial cavity filter comprises the coaxial cavity resonator more than four, and two cross-coupling control elements between non-adjacent resonator, be coupled by window between the adjacent resonators.